The source for all your fluid power needs. Solutions. Period.

Toggle Nav
Cart
Search
main product photo

MONARCH SEAL KIT

Ask A Question
Alternate Part Numbers
Alternate Part Number 639580, Alternate Part Number C1DK20
Brand
Monarch Industries Inc
Brand
Monarch Industries
Pack Size
1.00
UOM
EA
Supplier Part Number
639580
Product Weight
0.11 lbs
Product Questions & Answers 1

Product Questions & Answers

Trying to track down the right seal kit for a Monarch hydraulic unit and I keep running into wrong part numbers. This one listed as 639580, that the same as C1DK20?
Question by: Janice W on Jan 22, 2026, 9:00 AM
Both numbers refer to the same kit. The supplier part number is 639580, and C1DK20 is an alternate part number for the same product. The SKU on this one is RK40L-150, so if you're cross-referencing across a few different sources, any of those identifiers should point you to the right place.
Answer by: Customer Support on Jan 23, 2026, 5:47 PM